This is the latest I dare leave it 15 August to gather the hazel nut harvest, or the whole crop might be reduced to just shells, via any squirrels that I missed trapping.
This year Cosford and Halls Giant came out with highest cracking percentage. But Butler would come out the best as it has a bigger crop. This data is by no means scientific, as there are lost of variables, ie some would be better if left another month or so before harvest.